I want to be able to verify that there are no pixels below certain values in a histogram. If I take an image that's properly exposed with no clipping, I should be able to use this tool to see that there are no pixels below a value of 5 or over a value of 250. A standard histogram doesn't give me such a fine horizontal scale, nor would I be able to tell if a value range had, say, five pixels in it when comparing to the exposed area which is going to have thousands of pixels. I know G'MIC can give me a histogram (as can darktable, rawtherapee, etc), but I wanted to see if I could possibly get the actual values being used to draw that histogram.
I know, it's totally obsessive-compulsive, but I want it for a specific evaluation and should I have to defend an image I want to be able to have the data to back me up on it.